LAD-240B — 240W low-profile AC/DC power supply for security and fire alarm systems with battery charger and UPS function

LAD-240B is an economical 240W low-profile AC/DC power supply with a built-in battery charger and DC-UPS function. It supports a wide 90–264 VAC input range, provides a 27.6 VDC output, delivers efficiency up to 87.5%, and is designed for integration into security, fire alarm, emergency evacuation, and backup power systems. The unit also features TTL status signals for AC OK, battery disconnect or reverse polarity, battery low, battery full, and discharge monitoring.

Technical characteristics

• Rated power: 240W

• Output voltage: CH1 27.6V, CH2 13.8V

• Rated current: CH1 7.7A, CH2 1A (battery charger)

• Current range CH1: 0–8.7A

• Output voltage adjustment range CH1: 21.6–29V

• Ripple and noise: 150mVp-p

• Voltage tolerance: ±1.0%

• Line regulation: ±0.5%

• Load regulation: ±0.5%

• Input voltage range: 90–132VAC / 180–264VAC, switch selectable

• Frequency range: 47–63Hz

• Efficiency: up to 87.5%

• AC current: 4.4A / 115VAC, 2.4A / 230VAC

• Inrush current: 60A

• Leakage current: <0.5mA / 240VAC

• Hold-up time: 16ms / 230VAC, 12ms / 115VAC

• Battery cutoff: 21.5V ±0.5V

• Working temperature: -20 to +60°C

• Working humidity: 20–95% RH, non-condensing

• Dimensions: 215 × 115 × 30 mm

• Weight: 0.75 kg

• Battery compatibility: lead-acid and lithium-ion batteries

• Warranty: 3 years